1999 allante has a surge idle

I can start the car and it will run but the rpm goes any where from 1600 rpm to 400 or even dies. Mostly it dies while driving it. If it sits there it'll bounce around tho. I put in a new t.p.s. (throttle positioning sensor) fuel filter. And still have the problem. I checked for vacume leaks but couldn't detect anything. Also shes a lil smokey out of the tail pipe. Its not burning oil or anything else. idk if thats part of the problem or what. If anyone has ideas plz help me out. I miss this car and automation is coming up and love bringing the car there. Thank you

5 Answers

A cool car- but that has the Northstar engine, correct?- if so, you
are in a world of trouble- it is better to get an earlier model with the
regular caddy engine- and find one with the analog gauges- like I
said, those later Allantes have some problems- good luck

No they didn't put the northstars in till 92 I believe. they
started with the digital gagues on the 90's model but left
358 of them with the anolog dash. If I remember
correctly. Anyway do U know what it could be now that
it's not a stupid N star

well, you are fortunate to avoid the Northstar- I love the
Pininfarina body, but I always figured it was a shame it had
caddy mechanicals- now- it sounds as if something electronic is
going wrong- something with the ignition or fuel injection- a
wrench who knows Cadillac can diagnose it- that's the beauty of
it being American, with an Italian body- you don't need a Ferrari
mechanic to fix it! here's another Pininfarina-

I have a 1991 Allante. The driver information display reads "anti-lock disengaged" then "traction disenged". "Brake" red light also displayed on dash which would mean a problem with the anti lock br...

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